Browser.display.auto quality min font size

From MozillaZine Knowledge Base

The title given to this article is incorrect due to technical limitations. The correct title is browser.display.auto_quality_min_font_size.

This article describes the preference browser.display.auto_quality_min_font_size. To add, delete, or modify this preference, you will need to edit your configuration — do not edit this article.

1 Background
2 Possible values and their effects
3 Caveats
4 Recommended settings
5 First checked in
6 Has an effect in
7 Related bugs
8 External links

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Background

With the move to the Cairo graphics backend, Mozilla’s text rendering code has changed significantly. Among the changes are support for advanced ligatures and smarter kerning. As these features are more computationally intensive than previous text rendering, they are only used at larger font sizes (where the quality difference is more noticeable), or when the text is affected by the CSS property text-rendering: optimizeLegibility.

This preference controls the minimum font size at which the high-quality rendering is used. Text below this size uses the high-speed path, and text at and above this size uses the high-quality path.

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Possible values and their effects

A non-negative integer, specifying device pixels. Text rendered at this size or larger is optimized for display quality rather than display speed. Default is 20.

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Caveats

Text in chrome (the UI) is always rendered with the high-quality path.
Web pages can override the effects of this preference by specifying the text-rendering CSS property.

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Recommended settings

To use the highest quality display and legibility settings for all rendered text, set this preference to 0. Conversely, setting this preference to a very high number will cause Mozilla to use the fastest rendering methods for all text.

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